Dictionary

tourmaline

noun tour·ma·line \ˈtr-mə-lən, -ˌlēn\

Definition of TOURMALINE

:  a mineral of variable color that consists of a complex borosilicate and is valued as a gem when transparent and cut
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Origin of TOURMALINE

Sinhalese toramalli carnelian
First Known Use: 1759

Other Mineralogy Terms

agate, host, inclusion, matrix, streak

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